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Rock wool for potting.

Discussion in 'Orchid Culture' started by Paul222, Oct 8, 2023.

  1. Paul222

    Paul222 New Member

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    I am wondering if this is still used much for potting. I have been away from this for some years and I recently got back into it... I have a few plants which will be needing repotting soon den. asmosum, lindlii and a few others mostly catt family. This forum is interesting... where was it 30 yrs ago?.
  2. The tomato

    The tomato Member

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    I haven’t seen it used for orchids outside of old books since I only started in the past couple of years, but I see no reason why it wouldn’t work, it’s just kind of hard to come by.
  3. Ray

    Ray Orchid Iconoclast Supporting Member

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    Oak Island NC
    100% of my collection of paphs, phrags, and a few phals are in inert media, either LECA for those in semi-hydroponic culture, or a mixture of LECA and Grodan rockwool cubes (25%-33% of the volume) for those in "traditional" culture.

    In the old days, I experimented with the rockwool batting that was sold in both hydrophobic and hydrophilic forms, and never had any success. Having discrete 1 cm cubes in an otherwise very open and airy mix works great. It's sort of an inorganic form of "bark with bits of sphagnum".

    There is a great grower of phrags that has his in 75% cubes and 25% perlite - mainly to maintain air channels in the cubes, albeit smaller than I prefer.

    (This seems like a natural evolutionary path - I started growing orchids while getting degrees in Ceramic Engineering in the 70's, so growing in clay and glass seems appropriate, even if it's taken me 50 years to get there.)
    Alex Shepack likes this.